Synthesis of diamond-like carbon films with super-low friction and wear properties
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1 Synthesis of diamond-like carbon films with super-low friction and wear properties MSE 676 All Things Carbon / A. Erdemir, O.L. Eryilmaz, and G. Fenske J. Vac. Sci. Technol. A 18(4), Jul/Aug Deepak Rajput Center for Laser Applications UT Space Institute, Tullahoma Tennessee 37388, USA drajput@utsi.edu Web:
2 Introduction Unique mechanical, chemical, optical, and electrical properties. Quite hard, strong, and stiff. Most DLC films are electronically insulating and can be made optically transparent to visible and ultraviolet light. DLC films are chemically inert and impervious to acidic and saline media. They are amorphous and made of sp 2 -andsp 3 - bonded carbon atoms. 2
3 Introduction DLC films may also have large amounts of hydrogen in their amorphous structures. Hydrogen-free DLC films can also be deposited. Doping DLC films to achieve better electrical and mechanical properties is also possible. DLC films deposition range: subzero to 400 o C. Processes: plasma or ion beam- PVD and CVD. Carbon source: hydrocarbon gas like CH 4,C 2 H 2. 3
4 Tribology The mechanical and tribological properties depend on microstructures, chemistry, hydrogen content, sp 2 /sp 3 bonded carbon. Test conditions strongly influence the friction and wear performance. Friction coefficients of the DLC films: 0.01 to >0.5 Relative humidity has the greatest effect on the friction of DLC films. Low humidity: 0.01; high humidity:
5 Tribology Hydrogen-free DLC films: best in humid air Hydrogenated DLC films: best in dry or inert conditions. At high temperatures, most undoped DLC films undergo permanent chemical and microstructural changes that degrade their friction and wear behavior (e.g., graphitization). A new DLC film with coefficient of friction in inert-gas environments. 5
6 Experimental Process: Plasma Enhanced Chemical Vapor Deposition (PE-CVD) at room temperature. Coated with nm silicon bond layer prior to deposition on AISI M50 balls, H13 steel disks, and sapphire balls and disks. Source gas: Pure methane Mixture of methane and increasing hydrogen Film thickness: 1 μm 6
7 Experimental Friction and wear test: Ball-on-disk tribometer Conditions: Dry nitrogen under a load of 10 N. Hardness of steel balls and substrates: 8 GPa. Hardness of sapphire: 35 GPa Surface roughness better than 0.05 μm (steel). Wear volume determined: 3.14d W b = 64r 4 d is the diameter of the wear scar r is the radius of the ball 7
8 Results SEM micrograph TEM micrograph Source gas: 25% CH % H 2 Structurally amorphous, free of volume defects, and well bonded to the substrate 8
9 Results Variation of coefficients of friction for different source gas compositions 9
10 Results Wear rate comparison of various DLC-coated M50 balls sliding against DLC-coated H13 disks in dry nitrogen. 10
11 Results Substrate material influences frictional performance Friction coefficient of DLC film produced on sapphire substrates in a 25% CH % H 2 plasma. 11
12 Proposed Mechanism Hydrogen chemically bonds and effectively passivate the free σ bonds of carbon atoms in the DLC films and make them chemically very inert. C-H bond is covalent and stronger than single C- C, C-O, or C-N bonds. Increased hydrogen etches out or remove the sp 2 -bonded or graphitic carbon precursor from the film surface and thus prevent the formation of planar graphitic phases and/or cross-linking that can give rise to π bonding (C=C double bonds gives rise to high friction). 12
13 Summary DLC films grown with pure CH 4 exhibit relatively poor friction and wear performance. DLC films grown with CH 4 + increasing H 2 exhibit increasingly better friction and wear performance. DLC films grown on hard and highly rigid sapphire substrate have friction coefficient of ~ for 25% CH % H 2. The main reason is the difference in hydrogen concentration on the sliding surfaces as well as within the bulk DLC structures. Higher hydrogen concentration on sliding surface is analogous to better shielding or passivation of carbon bonds and hence lower friction. 13
14 Dr. Ali Erdemir Argonne National Laboratory, IL Image courtesy: Picture courtesy:
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